Plan Ahead for 2018 Mingo Observatory Star Party Dates: The Star Parties will be held WEATHER PERMITTING. The public should call 724-348-6150 for more information. The Mingo Observatory, owned and operated by the Amateur Astronomers Association of Pittsburgh is located in Mingo Creek County Park, Washington County, Nottingham Twp, PA. Coordinates: Latitude 40.211 degrees N, Longitude 80.020 degrees W. Map and Directions under the About Tab at www.3ap.org .